How to Convert Image Formats: JPG, PNG, and WebP

Switch between JPEG, PNG, and WebP for smaller files and wider compatibility.

KPM Editorial · Guides · 2026-10-11 · 4 min read

Which format should you use

Each format has a job. JPEG is best for photos, PNG keeps transparency and sharp lines, and WebP is smaller than both with wide browser support. Converting to the right format can cut file size by half with no visible difference. Our converter handles single images instantly using canvas rendering locally, so designers, sellers, and students can standardize uploads in seconds.

Step-by-step: convert a format

1. Open the image format converter and load your source file by dragging it into the tool.
2. Check the detected input format and file size shown in the info panel before changing anything.
3. Select your target format. Choose WebP for web uploads, PNG for transparency, or JPEG for maximum compatibility.
4. Adjust the quality slider if available. Photos look great at 80 percent WebP or JPEG quality.
5. Preview the output and confirm transparency is preserved if your image has an alpha channel.
6. Download the converted file and rename it clearly so you know which version is which.
7. Test the new file where it will be used, such as your store uploader or slide deck, before deleting anything.

Tips for the best results

• Photos to WebP: expect 25 to 35 percent smaller files than the same JPEG quality.
• Keep a PNG master: always archive the original before converting to a lossy format.
• Transparency warning: JPEG has no transparency, so use PNG or WebP if you need a clear background.
• Old devices: stick with JPEG or PNG when sending to printers or legacy software.

Common mistakes to avoid

• Converting lossy to lossy: turning a small JPEG into WebP will not restore detail already lost.
• Forgetting transparency: exporting a logo with a clear background to JPEG fills it with white or black.
• Deleting masters: keep the original file archived so future conversions start from full quality.

Privacy note

Conversion is processed in-browser with no uploads and no tracking. Sensitive documents and private photos stay on your own machine from start to finish, safe from prying eyes.